Standard method of measurement (civil works): Which of the following items is measured by weight per quintal (100 kg)?

Introduction:
Estimating and costing for building works follows standard measurement rules so that quantities and rates are comparable. Some items are measured by length (metre), some by area (square metre), some by volume (cubic metre), and some by weight. This question checks whether you know which common item is measured by weight per quintal (100 kg).

Given Data / Assumptions:

• Quintal = 100 kg.
• We consider usual building measurement practice for common items like steel, shutters, gates, and wire mesh.
• Mild steel (M.S.) reinforcement in reinforced cement concrete (R.C.C.) is priced and recorded by weight.

Concept / Approach:
Reinforcement steel is supplied and accounted for by mass because design drawings specify bar diameters and lengths that translate directly to weight. Other fabricated or sheet-like items (rolling shutters, collapsible gates, expanded metal mesh) are typically measured by area for fair comparison and market practice.

Step-by-Step Solution:
Identify the item conventionally measured by weight: M.S. reinforcement.Confirm the unit used in many schedules: per quintal (100 kg).Contrast with shutters, gates, and meshes—these are measured by area (m^2), not by quintal, under standard rules.Select the option that states reinforcement is measured per quintal.

Verification / Alternative check:
Bar bending schedules compute tonnage from lengths and diameters. Supplier invoices and rate analyses for steel reinforcement are weight-based, aligning with per-quintal or per-tonne billing.

Why Other Options Are Wrong:
Collapsible gates with rails: Usually m^2 (sometimes including track length separately).Rolling shutters: Measured by m^2 with accessories; not by weight for BOQ payment.Expanded metal wire netting: Typically m^2.Timber scantlings: Normally m^3 for structural timber.

Common Pitfalls:
Assuming all metal items are measured by weight; in building works, only certain items (like reinforcement steel) are weight-based, while fabricated assemblies are area-based for estimation consistency.

Final Answer:
M.S. reinforcement for R.C.C. works (measured per quintal).